SHEET. NXP MC68302

Below you will find brief information for ISDN Development System M68SC302 ADS. The M68SC302 ADS is designed to allow the MC145572 to be configured in most of its operating modes. The M68SC302ADS has logic analyzer connectors and expansion connectors, providing physical connection to all pins of the SC302 on the board. The logic analyzer connectors enable access to the bus activity and the I/O pins of the SC302, and some of the S/T and U transceivers pins. The expansion connector is located at the top of the board and provides most of the M68SC302 signals and some important transceiver signals. This connector is intended to be used as a connector for user specific breadboards or daughter cards for functions such as modems and POTs interfaces.

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ISDN Development System M68SC302 ADS User’s Manual | Manualzz

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Key features

  • MC68SC302 operating @20.48Mhz

  • Host computer interface with ISA Bus or PCMCIA bus

  • ISA PnP Interface supporting 8 and 16 bit memory and IO accesses

  • Option for three types of serial EEPROM for the PCMCIA or ISA Configuration

  • Powered by the ISA, PCMCIA connectors or external power connector

  • Complete connectivity with 2B1Q for connection to U interface

  • The U interface transceiver MC145572 interfaced to the M68SC302 either by IDL or GCI interface (selectable). Can be configured in NT or LT mode

  • The U interface transceiver MC145574 interfaced to the M68SC302 either by IDL or GCI interface (selectable). Can be configured in TE or NT mode

  • The S/T interface transceiver MC145574 used as a Master TE or NT interfaced to the M68SC302

  • The MC68SC302 can set up to have its system clock provided by the by the MC145572 BUFXTAL output requiring only one crystal in the system

Frequently asked questions

The M68SC302ADS board features an MC68SC302 operating at 20.48Mhz, a host computer interface with ISA Bus or PCMCIA bus, an ISA PnP Interface supporting 8 and 16 bit memory and IO accesses, an option for three types of serial EEPROM for the PCMCIA or ISA Configuration, power supplied by the ISA, PCMCIA connectors or an external power connector, complete connectivity with 2B1Q for connection to the U interface, a U interface transceiver MC145572 interfaced to the M68SC302 either by IDL or GCI interface (selectable). The U interface transceiver can be configured in NT or LT mode. There is also a U interface transceiver MC145574 interfaced to the M68SC302 either by IDL or GCI interface (selectable). This transceiver can be configured in TE or NT mode. Additionally, the S/T interface transceiver MC145574 is used as a Master TE or NT interfaced to the M68SC302. The MC68SC302 can be set up to have its system clock provided by the MC145572 BUFXTAL output requiring only one crystal in the system. The S/T transceiver can use the M68SC302 system clock for its system clock requiring only one crystal in the system. The M68SC302ADS board also has logic analyzer connectors compatible to probe M68SC302 activity and some of the S/T and the U transceivers signals.

To select between S/T and U interface master, you need to use the DS3 - 2 dip switch. When this dip switch is ON, the S/T will be the master, and when it's OFF, the S/T will be the slave. Conversely, when the dip switch is ON, the U chip will be the slave, and when it's OFF, the U chip will be the master.

DS2 SW 6 selects between full GCI (ON) or IDL (OFF) modes. In IDL mode, the U transceiver is controlled by the SCP port, and to connect the 68SC302 SCP port to the U chip SCP pins, DS2 SW 1,2,3, 4 should be set to ON. When DS2(6) is ON, the MC145572 is configured for Full GCI mode, and DS2(1-4) must be OFF.

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